toxic

Carcinogenic, poisonous, or otherwise directly harmful to life in any form. Practically every substance is toxic, the only difference is in the quantity (dose) that produces a toxic effect (see toxicity). Technically, a substance is toxic if its (1) medial lethal dose (Lethal Dose 50 or LD50) is more than 50 milligrams (but not more than 500 milligrams) per kilogram of body weight when administered orally to albino rats weighing between 200 to 300 grams each, (2) LD50 is more than 200 milligrams (but not more than 1000 milligrams or 1 gram) per kilogram of body weight when administered by continuous contact for 24 hours (or less if death occurs within 24 hours) with the bare skin of albino rabbits weighing between 2 to 3 kilograms each, (3) median lethal concentration (Lethal Concentration 50 or LC50) in air is more than 200 parts per million (but not more than 2000 parts per million) by volume of gas or vapor (or more than 2 milligrams per liter but not more than 20 milligrams per liter of dust, fume, or mist) when administered by continuous inhalation for more than 1 hour (or less if death occurs within 1 hour) to albino rats weighing between 200 to 300 grams each.